Summary
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1.
The moments of phthalic, citraconic and succinic anhydrides have been measured, the first two in benzene as solvent and the last in dioxane. The moment values at 20° C. are respectively 5·25, 4·27, and 4·20×10−18 e.s.u.
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2.
The moment values are considerably high compared with the moments of the corresponding compounds phthalic and succinic imides.
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3.
The moments are interpreted as due to a strong resonance structure, which reverses the normal direction of moment to be expected from vectorial addition.
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References
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Rau, M.A.G., Anantanarayanan, N. The dipole moment and structure of some cyclic anhydrides: Phthalic, succinic and citraconic anhydrides. Proc. Indian Acad. Sci. (Math. Sci.) 5, 185–192 (1937). https://doi.org/10.1007/BF03036174
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DOI: https://doi.org/10.1007/BF03036174